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Added Magnetometer.expectedMagneticFieldStrength() method

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Original file line number	Diff line number	Diff line change
`@@ -56,6 +56,12 @@ class Magnetometer {`
`56`	`56`	`// Results are in uT (micro Tesla).`
`57`	`57`	`virtual bool readMagneticField(float &x, float &y, float &z) = 0;`
`58`	`58`
	`59`	`+ // Returns the expected field strength. Filter algorithms can use this value`
	`60`	`+ // to detect and ignore when a strong magnetic field or nearby ferrous metal`
	`61`	`+ // objects interfere with the magnetometer readings.`
	`62`	`+ // Defaults to 50.0 uT for sensors that lacks this calibration info.`
	`63`	`+ virtual float expectedMagneticFieldStrength() { return 50.0f; }`
	`64`	`+`
`59`	`65`	`// Number of samples in the FIFO.`
`60`	`66`	`virtual unsigned int availableMagneticField() { return 1; }`
`61`	`67`

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